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/*
* Init function for the library.
*
* Copyright (C) 2008, 2009 Mark Lee <libdesktop-agnostic@lazymalevolence.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author : Mark Lee <libdesktop-agnostic@lazymalevolence.com>
*/
[CCode (cheader_filename = "libdesktop-agnostic/desktop-agnostic.h")]
namespace DesktopAgnostic
{
public errordomain ModuleError
{
NO_GMODULE
}
private void
debug_msg (string message)
{
if (Environment.get_variable ("DESKTOP_AGNOSTIC_MODULE_DEBUG") != null)
{
debug (message);
}
}
private static Datalist<Module> modules;
/**
* Based on the PluginRegistrar class in
* [[http://live.gnome.org/Vala/TypeModules]].
*/
public class ModuleLoader : Object
{
private static string[] paths;
private static delegate Type RegisterModuleFunction ();
private static ModuleLoader? module_loader = null;
static construct
{
paths = new string[]
{
Environment.get_variable ("DESKTOP_AGNOSTIC_MODULE_DIR"),
Path.build_filename (Build.LIBDIR, "desktop-agnostic", "modules"),
Path.build_filename (Environment.get_home_dir (), ".local", "lib",
"desktop-agnostic")
};
modules = Datalist<Module> ();
}
private static delegate Type GuessModuleFunction (ModuleLoader loader,
string library_prefix);
private Module? module_guesser;
private ModuleLoader ()
{
assert (Module.supported ());
this.module_guesser = null;
}
public static unowned ModuleLoader
get_default ()
{
if (module_loader == null)
{
module_loader = new ModuleLoader ();
}
return module_loader;
}
public static string[]
get_search_paths ()
{
return paths;
}
public Type
load_from_path (string name, string path)
{
Module module = null;
debug_msg ("Loading plugin with path: '%s'".printf (path));
module = Module.open (path, ModuleFlags.BIND_LAZY);
if (module == null)
{
critical ("Could not load the module '%s': %s",
path, Module.error ());
return Type.INVALID;
}
else
{
void* function = null;
module.symbol ("register_plugin", out function);
if (function == null)
{
critical ("Could not find entry function for '%s'.", path);
return Type.INVALID;
}
else
{
RegisterModuleFunction register_plugin;
register_plugin = (RegisterModuleFunction) function;
modules.set_data (name, (owned)module);
return register_plugin ();
}
}
}
public Type
load (string name)
{
string path;
Type module_type = Type.INVALID;
foreach (unowned string prefix in this.paths)
{
if (prefix == null || !FileUtils.test (prefix, FileTest.IS_DIR))
{
continue;
}
path = Module.build_path (Path.build_filename (prefix,
Path.get_dirname (name)),
Path.get_basename (name));
module_type = this.load_from_path (name, path);
debug_msg ("Plugin type: %s".printf (module_type.name ()));
if (module_type != Type.INVALID)
{
break;
}
}
if (module_type == Type.INVALID)
{
// try the current directory, as a last resort
path = Module.build_path (Environment.get_current_dir (),
Path.get_basename (name));
module_type = this.load_from_path (name, path);
if (module_type == Type.INVALID)
{
warning ("Could not locate the plugin '%s'.", name);
}
}
return module_type;
}
public bool
is_guess_module_loaded ()
{
return this.module_guesser != null;
}
private Module?
try_load_guess_module (string prefix)
{
string library = "libda-module-guesser";
string path;
path = Module.build_path (prefix, library);
return Module.open (path, ModuleFlags.BIND_LAZY);
}
public Type
guess_module (string library_prefix)
{
void* function;
unowned GuessModuleFunction guess_module;
if (this.module_guesser == null)
{
// load the module guesser
foreach (unowned string prefix in this.paths)
{
if (prefix == null || !FileUtils.test (prefix, FileTest.IS_DIR))
{
continue;
}
this.module_guesser = this.try_load_guess_module (prefix);
if (this.module_guesser != null)
{
break;
}
}
if (this.module_guesser == null)
{
// try the current directory, as a last resort
this.module_guesser = this.try_load_guess_module (Environment.get_current_dir ());
}
}
assert (this.module_guesser != null);
this.module_guesser.symbol ("guess_module", out function);
guess_module = (GuessModuleFunction)function;
return guess_module (this, library_prefix);
}
}
private static KeyFile module_config = null;
public Type
get_module_type (string prefix, string key) throws GLib.Error
{
unowned ModuleLoader? loader = null;
string cfg_file = "desktop-agnostic.ini";
if (!Module.supported ())
{
throw new ModuleError.NO_GMODULE ("libdesktop-agnostic requires GModule support.");
}
loader = ModuleLoader.get_default ();
if (module_config == null && !loader.is_guess_module_loaded ())
{
bool loaded_config = false;
string system_path;
string user_path;
module_config = new KeyFile ();
// load the system file first
system_path = Path.build_filename (Build.SYSCONFDIR, "xdg",
"libdesktop-agnostic", cfg_file);
try
{
if (FileUtils.test (system_path, FileTest.EXISTS))
{
debug_msg ("Loading module config from the system: '%s'".printf (system_path));
loaded_config = module_config.load_from_file (system_path,
KeyFileFlags.NONE);
}
}
catch (KeyFileError error)
{
warning ("KeyFile error: %s", error.message);
}
user_path = Path.build_filename (Environment.get_user_config_dir (),
cfg_file);
try
{
if (FileUtils.test (user_path, FileTest.EXISTS))
{
debug_msg ("Loading module config from the user directory: '%s'".printf (user_path));
loaded_config |= module_config.load_from_file (user_path,
KeyFileFlags.NONE);
}
}
catch (KeyFileError error)
{
warning ("KeyFile error: %s", error.message);
}
}
if (module_config.has_group ("DEFAULT"))
{
string library = "libda-%s-%s".printf (prefix,
module_config.get_string ("DEFAULT", key));
return loader.load (library);
}
else
{
debug_msg ("No module config files found, falling back to guessing.");
string library_prefix = "libda-%s-".printf (prefix);
return loader.guess_module (library_prefix);
}
}
}
// vim: set et ts=2 sts=2 sw=2 ai :
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